Origin of the mass splitting of azimuthal anisotropies in a multiphase transport model

Hanlin Li, Liang He, Zi-Wei Lin, Denes Molnar, Fuqiang Wang, and Wei Xie
Phys. Rev. C 96, 014901 – Published 5 July 2017

Abstract

Both hydrodynamics-based models and a multiphase transport (AMPT) model can reproduce the mass splitting of azimuthal anisotropy (vn) at low transverse momentum (p) as observed in heavy ion collisions. In the AMPT model, however, vn is mainly generated by the parton escape mechanism, not by the hydrodynamic flow. In this study we provide detailed results on the mass splitting of vn in this transport model, including v2 and v3 of various hadron species in d+Au and Au+Au collisions at the Relativistic Heavy Ion Collider and p+Pb collisions at the Large Hadron Collider. We show that the mass splitting of hadron v2 and v3 in AMPT first arises from the kinematics in the quark coalescence hadronization process, and then, more dominantly, comes from hadronic rescatterings, even though the contribution from the latter to the overall charged hadron vn is small. We further show that there is no qualitative difference between heavy ion collisions and small-system collisions or between elliptic (v2) and triangular (v3) anisotropies. Our studies thus demonstrate that the mass splitting of v2 and v3 at low p is not a unique signature of hydrodynamic collective flow but can be the interplay of several physics effects.

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  • Received 15 June 2016
  • Revised 13 May 2017

DOI:https://doi.org/10.1103/PhysRevC.96.014901

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Hanlin Li1,2, Liang He2, Zi-Wei Lin3,4, Denes Molnar2, Fuqiang Wang5,2,*, and Wei Xie2

  • 1College of Science, Wuhan University of Science and Technology, Wuhan, Hubei 430065, China
  • 2Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
  • 3Department of Physics, East Carolina University, Greenville, North Carolina 27858, USA
  • 4Key Laboratory of Quarks and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan, Hubei 430079, China
  • 5School of Science, Huzhou University, Huzhou, Zhejiang 313000, China

  • *fqwang@purdue.edu

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Vol. 96, Iss. 1 — July 2017

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